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From: "vz-gdb at zeitlins dot org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug c++/9541] Bogus "warning: can't find linker symbol for virtual
 table for 'Foo' value" messages
Date: Thu, 29 Nov 2012 20:03:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=9541

--- Comment #4 from vz-gdb at zeitlins dot org 2012-11-29 20:03:04 UTC ---
I can confirm that the problem still exists with 7.5.50.20121129-cvs version
(built from sources without any special configure options under bog standard
x64 Debian system). I didn't see it with wxWindow yet but just showing the
value of some random window pointer I see the following:

(gdb) p *this
$4 = (wxNumberEntryDialog) {
  <wxDialog> = {
    <wxDialogBase> = {
      <wxTopLevelWindow> = {
        <wxTopLevelWindowGTK> = {
          <wxTopLevelWindowBase> = {
            <wxNavigationEnabled<wxNonOwnedWindow>> = {
              <wxNonOwnedWindow> = {
                <wxNonOwnedWindowBase> = {
                  <wxWindow> = {
                    <wxWindowBase> = {
...
                      m_font = warning: can't find linker symbol for virtual
table for `wxFont' value
{
                        <wxFontBase> = {
                          <wxGDIObject> = {
                            <wxObject> = {
                              _vptr.wxObject = 0x67e510
<_ZTV6wxFont@@WXU_2.9+16>,
                              m_refData = 0x0
                            },
                          },
                        },
                      },
                      m_backgroundColour = warning: can't find linker symbol
for virtual table for `wxColour' value
{
                        <wxColourBase> = {
                          <wxGDIObject> = {
                            <wxObject> = {
                              _vptr.wxObject = 0x67b330
<_ZTV8wxColour@@WXU_2.9+16>,
                              m_refData = 0x0
                            },
                          }, <No data fields>},
                      },
...
(gdb) p this->m_font
$5 = warning: can't find linker symbol for virtual table for `wxFont' value
warning: can't find linker symbol for virtual table for `wxFont' value
{
  <wxFontBase> = {
    <wxGDIObject> = {
      <wxObject> = {
        _vptr.wxObject = 0x67e510 <_ZTV6wxFont@@WXU_2.9+16>,
        m_refData = 0x0
      },
    },
  },
}

AFAICS there is absolutely nothing special about wxFont and wxColour classes
compared to many others that it doesn't seem to have problems with.

Please let me know if there is anything else I can do to help finding this bug.

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